JPH05129817A - Antenna unit - Google Patents

Abstract

PURPOSE:To obtain the antenna unit which makes the strength of an entire antenna, prevents stress from being concentrated to one point when applying external force and is hardly bent by providing a thin conductor part on the surface while using a flexible bar-shaped insulator for the core of the entire antenna. CONSTITUTION:An external antenna 2 is equipped with an insulating part at the upper part of the conductor part. As the structure, a flexible bar-shaped insulator 3 is used as the core, a thin conductor layer 4 is provided on the surface of the bar-shaped insulator 3 excepting for the insulating part and further, a cover 5 is provided on the entire surface. When the external antenna 2 is extended from an enclosure 8, the conductor layer 4 is capatively coupled with a built-in antenna 1 and when the external antenna is housed in the enclosure 8, the conductor layer is not coupled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna for a portable mobile radio communication device.

[0002]

2. Description of the Related Art An antenna device comprising an insulating portion and a conductive portion is formed by integrally molding a conductive coil with an insulating material as shown in FIG. 2, and the conductive coil is provided when an external force is applied. Since the strength of the insulator material is significantly different from
The stress was likely to concentrate at points b and b.

[0003]

The above-mentioned conventional technique has a problem that the antenna is easily broken because stress is concentrated at points a and b in FIG. 2 when an external force is applied.

An object of the present invention is to provide an antenna device in which stress is less likely to concentrate and breaks when an external force is applied.

[0005]

The above object is to provide a structure in which a flexible rod-shaped insulator is used as a core material, a thin conductor layer is provided on the surface of the core material, and a coating is provided on the entire surface. It is achieved by

[0006]

[Function] The strength of the whole antenna can be made uniform by using a flexible rod-like insulator for the core material of the whole antenna and providing a thin conductor portion on the surface, and stress is concentrated at one place when an external force is applied. Can be prevented.

[0007]

Embodiments of the present invention will be described in detail below with reference to the drawings.

1A and 1B are structural views showing a first embodiment of the present invention. FIG. 1A shows a state in which an external antenna 2 is housed in a housing 8, and FIG. 1B shows an external antenna from the housing 8. 2 shows a state in which 2 is extended. In the external antenna 2, a flexible rod-shaped insulator 3 is used as a core material, and a thin conductor layer 4 is provided on the surface of the rod-shaped insulator 3 except for the upper portion thereof. Constitute. The conductor layer 4 is capacitively coupled to the built-in antenna 1 when the external antenna 2 is extended from the housing 8, and is non-coupled when housed in the housing 8. Therefore, when the external antenna 2 is extended, the external antenna 2
However, when housed, the built-in antenna 1 operates as an antenna. According to this embodiment, the strength of the entire external antenna can be made substantially uniform by providing a flexible rod-shaped insulator on the core material and providing a thin conductor layer on the surface of the core material, and stress when external force is applied. It is possible to prevent the antenna from concentrating on one place, and realize an antenna device that is hard to break. Further, as shown in the figure, the entire surface of the external antenna 2 is covered 5
May be provided, and in this case, abrasion of the conductor layer 4 due to repeated extension and storage of the external antenna 2 can be prevented.

[0009]

According to the present invention, the strength of the entire antenna can be made uniform by using a flexible rod-shaped insulator as the core material of the entire antenna and providing a thin conductor portion on the surface thereof.
It is possible to prevent the stress from being concentrated in one place when an external force is applied, and to realize an antenna device that is hard to break.

[Brief description of drawings]

FIG. 1 is a structural diagram showing a first embodiment of the present invention.

FIG. 2 is a structural diagram showing a conventional technique.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Built-in antenna, 2 ... External antenna, 3 ... Rod-shaped insulator, 4 ... Conductor layer, 5 ... Coating, 6 ... Upper cap, 7 ...
Lower cap, 8 ... Casing, 9 ... Conductor coil.

Claims (4)

[Claims] 1. An antenna device comprising a built-in antenna (1) provided in a housing (8) of a wireless communication device and an external antenna (2) penetrating the housing and movable inside and outside the housing. The external antenna (2) has an insulating part above the conductor part, and its structure is such that a flexible rod-shaped insulator (3) having a length equal to the length of the external antenna (2) is used as a core material. A thin conductor layer (4) is provided on the surface of the removed rod-shaped insulator (3), and a coating (5) is further provided on the entire surface, and the conductor layer (4) is a casing for the external antenna (2). Capacitively coupled with the built-in antenna (1) when extended from the body (8),
An antenna device, which is uncoupled when housed in a housing (8). 2. The antenna device according to claim 1, wherein the conductor layer (4) is formed by conductor vapor deposition or plating. 3. The antenna device according to claim 1, wherein the conductor layer (4) is a conductive rubber. 4. A mobile radio communication device comprising the antenna device according to claim 1.